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Commit 4ce8c9a7 authored by Shobhit Kumar's avatar Shobhit Kumar Committed by Daniel Vetter
Browse files

drm/i915: Band Gap WA 



Note: No one seems to have docs for this, so this patch here is just
unreviewed black magic :(

Signed-off-by: default avatarShobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: default avatarymohanma <yogesh.mohan.marimuthu@intel.com>
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
[danvet: Add note about the doc situation.]
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent e9fd1c02

drivers/gpu/drm/i915/intel_dsi.c

+48 −0
Original line number Original line Diff line number Diff line
@@ -37,6 +37,51 @@ 
static const struct intel_dsi_device intel_dsi_devices[] = {

static const struct intel_dsi_device intel_dsi_devices[] = {

};

};







static void vlv_cck_modify(struct drm_i915_private *dev_priv, u32 reg, u32 val,

			   u32 mask)

{

	u32 tmp = vlv_cck_read(dev_priv, reg);

	tmp &= ~mask;

	tmp |= val;

	vlv_cck_write(dev_priv, reg, tmp);

}



static void band_gap_wa(struct drm_i915_private *dev_priv)

{

	mutex_lock(&dev_priv->dpio_lock);



	/* Enable bandgap fix in GOP driver */

	vlv_cck_modify(dev_priv, 0x6D, 0x00010000, 0x00030000);

	msleep(20);

	vlv_cck_modify(dev_priv, 0x6E, 0x00010000, 0x00030000);

	msleep(20);

	vlv_cck_modify(dev_priv, 0x6F, 0x00010000, 0x00030000);

	msleep(20);

	vlv_cck_modify(dev_priv, 0x00, 0x00008000, 0x00008000);

	msleep(20);

	vlv_cck_modify(dev_priv, 0x00, 0x00000000, 0x00008000);

	msleep(20);



	/* Turn Display Trunk on */

	vlv_cck_modify(dev_priv, 0x6B, 0x00020000, 0x00030000);

	msleep(20);



	vlv_cck_modify(dev_priv, 0x6C, 0x00020000, 0x00030000);

	msleep(20);



	vlv_cck_modify(dev_priv, 0x6D, 0x00020000, 0x00030000);

	msleep(20);

	vlv_cck_modify(dev_priv, 0x6E, 0x00020000, 0x00030000);

	msleep(20);

	vlv_cck_modify(dev_priv, 0x6F, 0x00020000, 0x00030000);



	mutex_unlock(&dev_priv->dpio_lock);



	/* Need huge delay, otherwise clock is not stable */

	msleep(100);

}



static struct intel_dsi *intel_attached_dsi(struct drm_connector *connector)

static struct intel_dsi *intel_attached_dsi(struct drm_connector *connector)

{

{

	return container_of(intel_attached_encoder(connector),

	return container_of(intel_attached_encoder(connector),
@@ -310,6 +355,9 @@ static void intel_dsi_mode_set(struct intel_encoder *intel_encoder) 
	/* Update the DSI PLL */

	/* Update the DSI PLL */

	vlv_enable_dsi_pll(intel_encoder);

	vlv_enable_dsi_pll(intel_encoder);





	/* XXX: Location of the call */

	band_gap_wa(dev_priv);



	/* escape clock divider, 20MHz, shared for A and C. device ready must be

	/* escape clock divider, 20MHz, shared for A and C. device ready must be

	 * off when doing this! txclkesc? */

	 * off when doing this! txclkesc? */

	tmp = I915_READ(MIPI_CTRL(0));

	tmp = I915_READ(MIPI_CTRL(0));